. >> reporter: governor romney joined forces with ryan in ohio and declared his running mate the winner, though instant polls were divided on that question. >> there was one person on the stage with thoughtfulness, who was respectful, who was steady and poised. there's one person on that stage you want to be with if there's a crisis and it's this man right here. >> reporter: president obama heads to williamsburg, virginia for three days of intensive debate prep. virginia is a battle ground state but no public events scheduled, no rallies. he'll be hitting the books with his top aides. anthony and rebeck characters i want to tell you about something troubling that happened outside of an obama campaign office in denver, colorado. a shot fired into the office. there were people inside. no one was hurt. you can see there that the glass was shattered. police in denver still investigating. they don't know whether the office was being targeted. >> nancy cordes in washington. thank you. and we want to get more on campaign 2012 and for that we turn to cbs news political director john dickerson w